﻿////////////////////////////////////////////////////////////////////////////////////////
//  IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING THIS SOFTWARE
//
//  By downloading, copying, installing or using the software you agree to this license.
//  If you do not agree to this license, do not download, install, copy or use the software.
//
// Copyright (C) 2013, AerVision Technologies Pty Ltd, all rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistribution's of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//
//   * Redistribution's in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//
//   * The name of AerVision Technologies, may not be used to endorse or promote products
//     derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors to demonstrate 
// www.AerCloud.net Framework as a Service API (FaaS), "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the copyright holder or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
////////////////////////////////////////////////////////////////////////////////////////

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Media.Imaging;

namespace App_AerCloudDemo.Utils
{
    public class ImageCache
    {
        public static BitmapSource loadingImage = null;

        private static string CacheDir()
        {
            string subDir = "";
            if (!string.IsNullOrWhiteSpace(Settings.Default.AccessKey))
                subDir = Settings.Default.AccessKey.Substring(0, 4) + @"\";
            var dir = Directory.GetCurrentDirectory() + @"\ImageCache\" + subDir;

            if (!Directory.Exists(dir))
                Directory.CreateDirectory(dir);
            return dir;
        }

        private static string FileName(string personName, string imageName)
        {
            return CacheDir() + personName + "." + imageName + ".png";
        }

        public static ImageData Get(string personName, string imageName)
        {
            string fileName = FileName(personName, imageName);
            if (File.Exists(fileName))
                return new ImageData(fileName);
            else
                return null;
        }

        public static void Put(string personName, string imageName, ImageData data)
        {
            if (data == null)
                return;

            string fileName = FileName(personName, imageName);
            
            File.WriteAllBytes(fileName, data.asPng);
        }

        public static void Delete(string personName, string imageName)
        {
            string fileName = FileName(personName, imageName);
            if (File.Exists(fileName))
                File.Delete(fileName);
        }

        public static void Delete(string personName)
        {
            var dir = CacheDir();
            var files = Directory.GetFiles(dir);
            foreach (var fileName in files)
            {
                var s = Path.GetFileNameWithoutExtension(fileName);
                if (s.IndexOf(personName + ".") == 0)
                    File.Delete(fileName);
            }
        }

        public static bool Exists(string personName, string imageName)
        {
            string fileName = FileName(personName, imageName);
            return (File.Exists(fileName));
        }

        public static void Clear()
        {
            var dir = CacheDir();
            if (Directory.Exists(dir))
            {
                var files = Directory.GetFiles(dir);
                foreach (var fileName in files)
                    File.Delete(fileName);
            }
        }
    }
}
